Hey RickT
The scale length is 24 13/16” to be exact.
I use standard banjo scale length measurements but take away the first fret. 26.25” standard minus the length of the first fret = 24 13/16”.
The measurements for standard fret distances is readily available online. I won’t post here because it’s a lot to type out and I’m in inches and you’re in metric, but I’m sure you’ll figure it out.